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• W1579920912 abstract "Residues Phe33 and Arg35, individually, and a composite mutation of residues Arg42, Ser43, and Lys44 were changed to alanine in the human glycoprotein hormone common alpha-subunit using site-directed mutagenesis. These specific residues are highly conserved across species and have by chemical modification and synthetic peptide approaches been implicated in the binding of human chorionic gonadotropin (hCG) to leutinizing hormone (LH) receptor. In the present study we tested the hypothesis that specific alpha-subunit amino acid residues which stabilize the hormone receptor interaction for hCG have the same function in human follicle-stimulating hormone (hFSH). Wild type or mutant alpha-subunit cDNAs were coexpressed with wild type hFSH or hCG beta cDNA in sialylation defective Chinese hamster ovary cells. Recombinant hormones were tested in a radioligand receptor competition assay, using rat testis membranes as a source of FSH and LH receptors. Mutant hFSH heterodimers F33A-FSH, R35A-FSH, Arg42-Ser43-Lys44/Ala42-Ala43-Ala44- FSH all displaced 125I-hFSH in a similar fashion, indicating that these residues are not important for binding of hFSH to the rat FSH receptor. On the other hand, F33A-CG evidenced a 5-fold decrease in binding, while R35A-CG had over a 100-fold decrease in binding to the rat LH receptor when compared to the wild type recombinant hCG. These data demonstrate that a receptor-binding site on the common alpha-subunit which is very important for hCG binding to LH receptor is not important for the binding of hFSH to FSH receptor. Our interpretation of these findings is that there are fundamental structural differences in the receptor interface contacts of the common alpha-subunit, which stabilize receptor binding among members of the glycoprotein hormone family." @default.
• W1579920912 created "2016-06-24" @default.
• W1579920912 creator A5031384487 @default.
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• W1579920912 date "1993-10-01" @default.
• W1579920912 modified "2023-09-26" @default.
• W1579920912 title "Site-directed alanine mutagenesis of Phe33, Arg35, and Arg42-Ser43-Lys44 in the human gonadotropin alpha-subunit." @default.
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• W1579920912 doi "https://doi.org/10.1016/s0021-9258(20)80585-7" @default.
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